給 mkvmerge GUI 添加 FLV 檔案會報錯:The file is an unsupported container format (Macromedia Flash Video (FLV))。即便是最新版本的 MKVToolnix 2.5.1
MKVToolnix 的 ChangeLog 有註明不支援 FLV
mkvmerge: enhancement: mmg outputs a more informative error message for known but unsupported input file types (e.g. ASF, FLV, MPEG TS) instead of the cryptic "file identification failed".